Adjustable feed-carriage for lathes.



CHRISTIAN ALBERT FISCHER, OF GRAND FORKS, NORTH DAKOTA.

ADJUSTABLE FEED-CARRIAGE FOR LATHES.

Specification of Letters Patent.

Patented Dec. 17, 1907- Application filed February 9- 1906. Serial No. 300-258- To all whom it may concern:

Be it known that I, ()ums'rms ALBERT FISCHER, a citizen of the. United States, and resident. of (iraml Forks, in the county of (irand Forks and State. of North Dakota, have invented anew and improved Adjustablev Feed-Carriawe for Lathes, of which the following is a fu i, clear, and exact description.

My invention contemplates certain new and useful improvements in means for governing the movement of the cross feed screw of tool slides for carriages of metal-turning lathcs in which a definite and predetermined amount of feed is obtained for any cutting tool.

The object of my invention is a device of this character which will be capable of adjusting the cross feed with such a nicety, that objects may be turned or threads cut therein with mathematical exactness.

A further object of my invention is a device of this character which is simple and reliable and which may be easily applied to the ordinary forms or types of hand fecdinglathes and screw-cutting machines and one. that will be available where it is desired to turn several different sizes on one piece of metal, or where threads of different depths are to be cut. The device is also well adapted for repair work, when a thread is to be cut and fitted for one part only.

With this and other objects in view as will more fully appear as the description proceeds, the invention consists in certain constructions, arrangements, and combinations of the )arts hereinafter fully described and claimed, reference being bad to the accompanying (.lrawing in which:

Figure. 1 is a longitudinal sectional view of a lathe carriage embodying the improvements of my invention, certain of the parts being shown in elevation; Fig. l is an end elcvationof the cross feed operatiugand regulating mechanism; Fig. 3 is aside elevation of the same taken at right angles to the view shown in Fig. 2; Fig. 4 is a fragmentary detail showing the reverse side of at )art of the mechanism shown in Fig. 2, and *ig. 5 is an enlarged sectional view taken on the line AA of Fig. 2. I

Corresponding and like parts are referred to in the followin r description and indicated in all the views 0 the drawings by the same reference characters.

Referring to the drawing, the numeral 1 designates the frame of a lathe provided with the usual ways, upon which the. carriage .2 slides. The carriage is here shown as provided with a top section 3 upon which the tool slide 4 is mounted. 'i he. slide -l is formed with a depending lug 5 in which the cross screw 6 works, said screw being journaled in the section 3 of the carriage as indicated at 7. The. tool slide. 4 supports a tool post 8 in which a tool 0 is mounted so as to turn or cut a piece of work It). The cross feed screw 6 is provided at one end with a crank for its actuation, said crank being provided with a handle 11 so that the screw may be readily turned and controlled.

Secured to the carriage by means of screws or similar fastenim means, as best shown in Fig. 2, is a metal ic ring or disk 12, which may be provided with suitable. attaching lugs 13. Against the outer face of the ring or disk 12 another ring 16 is held by means of screws, as best. seen m Fig. 5, and between these two rin s, a circular track 14 is formed. Mounted within the track 14 and adapted to freely rotate around the ring 12 is another ring 15 which is provided with a forwardly extended arm 15" carrying at its outer end a. pivoted linger 17. The said finger I? is ada )ted to be swung outwardly across the )atfi of movtsnent of the crank of the cross feed screw ti as illustrated in Fig. l, aml is also adapted to be swung lmckwardly and assume an angular position with res wet to its arm 15', as shown in Figs. 2, 3 and 5, out of the path of the said crank.

'lhe periphery of the ring 15 is provided with worm gear teeth 18, and the ring or disk I2 constitutes a support, not. only for the ring 1."), but also for a bracket it) which is pivoted to the said ring 12 at one end as indicated at .20 and which is limited in its pivotal movement by means of a slot 21 and a serew 32 working therein. dournuled in two extensions of the bracket it) is a microim-ter worm 23, which meshes with the gear is when the bracket it) is depressed to the. position shown inFig. 2, but which is free from such meshing engagement when the said bracket is raised to the position shown in Fig. 4. The micrometer worm 23 is provided with a scale as shown, if desired, and a thumb-o wrating head 24. The bracket it) is adapted to maintain the worm gear in mesh with the gear 18 by any convenient means, and for 110 this purpose I have shown in the present instance t 1e ring 12 provided with a springpressed catch 25 which cooperates with the bracket 19 by means of a notch 26 formed in the latter. The catch 25 is preferably provided with a convenient re easing means, such as the roughened surface 27. That end of the bracket 1.) which is formed with a notch, is beveled as best seen in Fig. 4, and it is therefore evident that the spring of the catch 25, when the latter has become disengaged from the notch .26 will cause the said catch to ride upon its beveled surface and move the bracket upwardly or outwardly and support it in its outward position. The bracket 19 may be provided with a pointer 2b, which shows the degree ol" rotation on a circular scale marked on the ring 1:), as shown in Fig. .2.

In the practical operation of my improved device, the tool is lirst properly placed in the tool post, while the bracket 19 is raised to the position shown in Fig. 4, so that the worm may be out of mesh with the gear 18 and the linger 17 extended as shown in Fig. l. The tool 9 is now led in on the work 10 by the crank, operated by the handle in the usual manner, until the. desired cut is obtained, the said cut being determined by any hand gage, such as the common calipers. As the crank is turned to feed the tool, the finger I? being in contact therewith will manifestly rotate the ring 15, and when the desired depth of out has been determined, the bracket 19 is depressed and the catch 25 will thereupon lock the worm 23 in mesh with the "car 18. Any further feed of the tool must )0 made by rotating the micrometer worm .23 as is obvious that the crank is prevented from turning in a direction to feed the screw owing to its engagement with the linger 17, and also to the further fact that the mug 15 can not be turned so long as it is locked from movement by the worm'23, except by turning the worm 23 itself. llence any further feed of the tool must be made by rotating the micrometer worm 23, and it is obvious that this worm may be turned to allow the feed to be turned a very small fraction of an inch, the crank being turned to cliect this nice adjustment and until it is brought up against the linger l7 and the latter is in its linal'exact position. It is clear that the crank may now be rotated away from the article being turned or cut and rotated back to exactly the same predetermined )osition, when any new work is inserted. To change the desired amount of feed, the catch 25 is moved out ol'- engagement with the bracket ll), and a new amount of feed easily adjusted in the same manner as described above.

The amount of rotation of the ring 15, and consequently the amount of feed, may be measured in cases of ordinary exactness on the scale of said ring; but where the greatest amount of exactness is re uired, the feed is finally measured by the mlcrometer gage, as will be readily understood.

Having thus described my invention 1 claim as new and desire to secure by Letters Patent:

1. The combination of a feed carriage for lathes, a tool slide laterally adjustable on said carriage, a cross l'ecd screw adapted to cll'ect the lateral movementol said tool slide aml provided with means for turning the screw, a ring revolubly mounted upon the carriage and provided with a worm periphery, means carried by said ring for limiting the. movement of the screw in one direction, a. micrometer worm also supported by said earriage and arranged to be moved into and out of meshing engagement with the. worm gear oi said ring, and means for locking said worm in engagement with said worm gear.

2. The combination of a feed carriage l'or lathes, a tool slide laterally adjustable on said carriage, a cross l'eed screw adapted to ell'eet the lateral movement of said tool slide and provided with means for turning the screw, a ring revolubly mounted upon the carriage and provided with a worm periphery, means carried by said ring for limiting the movement of the screw in one direction, and a micrometer worm also supported by said carriage and arranged to be moved into and out of meshing engagement with the worm oar of said rum. 3. 'l he combination of a feed carriage for lathes, a tool slide laterally adjustable on said carriage, a cross feed screw adapted to ell'ect the lateral movement of said tool slide and )rovidcd with an actuating crank, a ring revoiubl mounted upon the carriage and providet with a worm periphery, a linger carried by said rin Y and adapted to project out into the path 0 movement of said crank, a micrometer worm also supported by said carriage and arranged for meshing engagement with the worm gear of said ring, and means for locking said worm in engagement with said worm gear and for also holding said worm out of said engagement.

4. The combination of a feed carriage for lathes, a tool slide laterally detachable thereon, a cross feed screw adapted to cll'ect the lateral movement of said tool slide and provided with an actuating crank, a supportmg ring secured to said carriage, another ring mounted to turn about said supporting ring and provided with an arm projectile forwardly from its outer face, a PlVOtOt linger carried by said arm and adapted to be swung into the path of movement of the said crank, the said ring being provided with a worm gear, a bracket pivotally mounted on said supwrting ring, a micrometer worm journals in said bracket and adapted to engage the said worm gear, and means engagmg with the bracket, for locking the said worm journaled in sai worm in engagement with the said worm gear.

5. In a tool feed mechanism for lathes, the combination with a revoluble member provided with a worm gear periphery and a support for said member, of a pivoted bracket mounted on the su ort a micrometer d racket and adapted to engage the worm gear, the bracket being formed at its free end with a notch and a beveied surface below said notch, and a spring pressed catch formed with a hooked end, adapted to enter said notch to lock the worm in engagement with the worm gear, said hooked end being provided with a beveled outer surface adapted to engage the outer surface of the bracket whereby to support the bracket with the worm out of engagement with the gear.

6. In a tool feed mechanism for lathes, the combination with a revoiuble member provided with a worm gear eriphery and a sulpport for said member, 0 a bracket ivota mounted on the support and provi ed at its free end with a notch, a micrometer worm journaled in the free end of saidbracket and arranged for engagement with the worm gear, and a spring pressed catch mounted on said support and adapted to enter the notch of the bracket, whereb to lock the said worm in engagement wit 1 the worm gear.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHRISTIAN ALBERT FISCHER.

Witnesses:

L. A. BENNETT, 1*. B. Ammmvs. 

